A NEW METHOD FOR MEASUREMENT OF RADIO FREQUENCY INHOMOGENEITY IN MRI

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OGHABIAN M.A.; RIYAHI ALAM N.; MEHDIPOUR S.

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Journal Paper

Paper Information

Journal: Iranian Journal of Radiology Year:2003 | Volume:1 | Issue:3-4 Page(s): 113-119

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Information Journal Paper

Title

A NEW METHOD FOR MEASUREMENT OF RADIO FREQUENCY INHOMOGENEITY IN MRI

Author(s)

OGHABIAN M.A. | RIYAHI ALAM N. | MEHDIPOUR S. | Issue Writer Certificate

Keywords

MAGNETIC RESONANCE IMAGING

RF INHOMOGENEITY

IMAGE NONUNIFORMITY

SPIN ECHO

Abstract

We introduce a new method of measuring transmit and receive RF INHOMOGENEITY in different RF coils of MRI systems. In this method a single slice of a uniform phantom is imaged from different flip angles, using a standard SPIN ECHO protocol. The signal intensity in these images is then fitted to a mathematical model which describes the relationship between the signal intensity and flip angle of the SPIN ECHO images. The results of this curve fitting process are two parameters, T(r) and R(r), whose variation with the spatial position shows RF transmit, and receive non-uniformity, respectively. In this approach a linear profile of B1 field distribution and receive sensitivity of RF coils are achieved which is also applicable in vivo. The method can be used to assess any commercial MR scanner and is highly recommended for the quality control (QC) of those MR scanners which are devoid of complicated protocols such as SEθ-2 θ. Such systems are still running in different clinics especially in the developing countries where the latest high performance MR scanners are not available and many scanners lack standard maintenance services.

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APA: Copy

OGHABIAN, M.A., RIYAHI ALAM, N., & MEHDIPOUR, S.. (2003). A NEW METHOD FOR MEASUREMENT OF RADIO FREQUENCY INHOMOGENEITY IN MRI. IRANIAN JOURNAL OF RADIOLOGY, 1(3-4), 113-119. SID. https://sid.ir/paper/283536/en

Vancouver: Copy

OGHABIAN M.A., RIYAHI ALAM N., MEHDIPOUR S.. A NEW METHOD FOR MEASUREMENT OF RADIO FREQUENCY INHOMOGENEITY IN MRI. IRANIAN JOURNAL OF RADIOLOGY[Internet]. 2003;1(3-4):113-119. Available from: https://sid.ir/paper/283536/en

IEEE: Copy

M.A. OGHABIAN, N. RIYAHI ALAM, and S. MEHDIPOUR, “A NEW METHOD FOR MEASUREMENT OF RADIO FREQUENCY INHOMOGENEITY IN MRI,” IRANIAN JOURNAL OF RADIOLOGY, vol. 1, no. 3-4, pp. 113–119, 2003, [Online]. Available: https://sid.ir/paper/283536/en

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